#!/bin/bash

if [ $# -eq 0 ]
then
	echo "请输入梅同的年龄"
elif [ $1 -lt 18 ]
then
	echo "未成年的梅同"
elif [ $1 -lt 60 ]
then 
	echo "梅同已经成年"
else
	echo "梅同是老年人"
fi
